a) An Sb galaxy has an absolute magnitude in the B band of -20.21. i) Estimate the isophotal radius at 25 B - mag arcsec...

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a) An Sb galaxy has an absolute magnitude in the B band of -20.21. i) Estimate the isophotal radius at 25 B - mag arcsec...

a) An Sb galaxy has an absolute magnitude in the B band of -20.21.

i) Estimate the isophotal radius at 25 B - mag arcsec−2 .
ii) Estimate the rotational velocity of the galaxy.
iii) Estimate the angular rotation speed of a star at the isphotal radius in arsec yr−1

PLEASE HELP!

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